LA's housing is the major cost driver. Expect significantly higher rent than Miami, even for comparable neighborhoods. Groceries are slightly more expensive in LA, but not dramatically. Transportation is where Miami might surprise you. LA has a more developed public transit system, so you could potentially avoid car ownership, whereas Miami is much more car-dependent, adding to your expenses with insurance, gas, and maintenance. Entertainment costs are similar, but LA offers more free activities. Consider the impact of California state income tax versus Florida's lack of it.